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[34.76.50.19]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4404352a5f0sm80958005e9.1.2025.04.18.07.00.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Apr 2025 07:00:06 -0700 (PDT) From: Dmytro Maluka To: Dave Hansen Cc: Tom Lendacky , Dmytro Maluka , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), "H. Peter Anvin" , linux-kernel@vger.kernel.org (open list:X86 MM) Subject: [PATCH] x86/ioremap: Fix off-by-one in e820 check in memremap_should_map_decrypted() Date: Fri, 18 Apr 2025 13:59:55 +0000 Message-ID: <20250418135955.58190-1-dmaluka@chromium.org> X-Mailer: git-send-email 2.49.0.805.g082f7c87e0-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The end address in e820__get_entry_type() is exclusive, not inclusive. Note: untested, bug found by code inspection. Signed-off-by: Dmytro Maluka --- arch/x86/mm/ioremap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 331e101bf801..a44800a6196e 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -578,7 +578,7 @@ static bool memremap_should_map_decrypted(resource_size= _t phys_addr, } =20 /* Check if the address is outside kernel usable area */ - switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) { + switch (e820__get_entry_type(phys_addr, phys_addr + size)) { case E820_TYPE_RESERVED: case E820_TYPE_ACPI: case E820_TYPE_NVS: --=20 2.49.0.805.g082f7c87e0-goog